摘要：The Pearl River is the second-largest river in China in terms of water discharge and brings enormous amounts of nutrients and terrestrial organic matter to the South China Sea, which makes the Pearl River Estuary (PRE) highly eutrophic. However, the molecular composition and distribution of dissolved organic matter (DOM) in the PRE have scarcely been investigated. In this study, solid-phase extraction (SPE) was performed to collect DOM samples from PRE along a salinity gradient. The samples were characterised by negative-ion electrospray ionisation (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to analyse their molecular composition and spatial distribution. The FT-ICR MS results showed that the terrestrial organic matter was gradually diluted and/or degraded during the migration from the river to the coastal ocean. Furthermore, both sulfur containing and unsaturated molecules were highly abundant in the upper stream samples, which indicated that anthropogenic input might be another important source of the assigned DOM in PRE. A group of bio-refractory molecules, characterised as carboxylic-rich alicyclic-like molecules, was found to accumulate with the increase of salinity. The composition of the SPE-DOM showed a gradual variation with the salinity and spatial changes; however, the variation was slightly different from those in pristine estuaries. This study demonstrates that the molecular composition of DOM is crucial for elucidating its source and transformation in an estuary.

关键字：FT-ICR MS SPE-DOM

ISSN号：1448-2517

卷、期、页：卷: 17 期: 3 页: 240-251

发表日期：2020-01-01

影响因子：1.910000

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）

发表期刊名称：ENVIRONMENTAL CHEMISTRY

参与作者：李鹏辉,谢伟,何丁

第一作者：何晨,潘琼,张传伦,史权

论文类型：期刊论文

论文概要：何晨,潘琼,李鹏辉,谢伟,何丁,张传伦,史权，Molecular composition and spatial distribution of dissolved organic matter (DOM) in the Pearl River Estuary, China，ENVIRONMENTAL CHEMISTRY，2020，卷: 17 期: 3 页: 240-251

论文题目：Molecular composition and spatial distribution of dissolved organic matter (DOM) in the Pearl River Estuary, China